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Supergiant stars a. form from red giants. c. form planetary nebulae. b. fuse hydrogen into carbon. d. form supernovas.

User Leucos
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supergiants end thier lives by going supernova. A supernova is an explosion that occurs when a star runs out of feul and fusion stops.
User Superpig
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(D) form supernovas.
User RedPixel
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